Bottom hole plug for wells



1951 N. c. M INTYRE BOTTOM HOLE PLUG FOR WELLS Filed June 1s, 194s l I l l I I II Mrman GM- /n/gfe INVENTOR.

ATTORNEYS.

Patented Nov. 27, 1951 no'r'roM HOLE PLUG FOR WELLS 1 Norman C. McIntyre,.Ti1lsa, Okla. Application .Iune 18, 1948 Serial No.i33,695 & A 5. Claims. (01. It's-13) The invention relates to bottom hole plugs, adapted to be positioned in the bottom of an oil well below the lower end of the well casing, and to be expanded into close sealing engagement with the bottom of the hole for sealing off water, rising from the lower end of the hole.

A further object is to provide a bottom hole plug for oil wells comprising upper and lower members to which are connected the ends of an expanding sealing bag, in which bag cement is placed before lowering the device into the hole, and a telescopic connection within the bag connecting the upper and lower members.

A further object is to form the telescopic connection from an upper tubular cage member, through which the cement will flow into the bag and the other telescopic member with means for limiting the downward movement of the lower member in relation to the upper member.

A further object is to provide means carried by the telescopic member at its ends for clamping the marginal edges of the expansible member to the upper and lower members of the device.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a vertical transverse sectional view through the hole plug.

Figure 2 is a view similar to Figure 1, but showing the plug after it has been filled with concrete and being lowered in the well casing.

Figure 3 is a side elevation of the plug showing the same on the bottom of the well and expanded by the weight of the upper structure and cement.

Figure 4 is a detail sectional view through one side of the plug at its upper end.

Referring to the drawing, the numeral I designates a conventional form of well casing, which is advanced in the usual way in the well hole 2. The plug hereinafter set forth is adapted to be lowered into the hole 2 until it rests on the lower end 3 of the hole and adapted to seal off water from the bottom of the hole. The plug is used below the casing l.

The bottom hole plug comprises an upper member 4 and a bottom member 5. Members 4 and 5 are connected together for a telescopic connection 6, the upper section I of which is in cage form, having vertical apertures 8, through which cement flows, during the filling operation, to the chamber 9 of the yieldable packer sleeve III, for expanding the sleeve l0 into close sealing engagement at H with the wall of the hole 2, as clearly shown in Figure 3. The lower section 12 of the telescopic connection 6 is formed in rod form, and is provided with a head [3, slidably mounted in the cage section 1. Head 13 limits the elongation of the plug, incident to the weight of the cement [4 within the expansible sleeve ID. The upper end of the telescopic connection cage section 1 is provided with an annular flange I5, which grips the flange l6 of the member l0 and seals the same against the lower end I! of the upper member 4, when the member 4 is threaded downwardly at l8 on the telescopic section 1.

The lower end of the telescopic section [2 is provided with a plug 19 which threads into the lower member 5, and the plug l 9 is provided with an annular flange 20 within the sleeve ID for sealing the lower end of the sleeve at 2| against the lower member 5. The upper member 4 is provided with a removable bail 22 for handling the device. Upper member 4 is also provided with a. threaded filling aperture 23 through which cement is poured for filling the expansible sleeve Ill at the top of the well. After the filling operation, at the top of the well, the bail 22 is removed from the member 4, and a plug 24 is threaded into the filling opening 23, and acts as a closure. Plug 24 is provided with an eye 25 for the reception of a hook 25 carried by a lowering line 21. The bottom hole plug is then lowered through casing l until the lower member 5 engages the bottom 3 of the well, and at this point the fluid or plastic material within the expansible sleeve III will spread by gravity and also by the weight; of the members 4 and l, and will force the sleeve into close binding engagement with the hole wall I I. When the cement sets, the bottom of the well will be sealed off, consequently water will not rise into the well.

From the above it will be seen that a bottom hole plug is provided which is simple in construction, positive in its operation and one wherein the parts have been reduced to a minimum, and a portion of the telescopic connection utilized as a passage for cement to the interior of the sleeve [0.

The invention having been set forth what is claimed as new and useful is:

1. A bottom hole plug comprising upper and lower members, an expansible sleeve connecting said members and adapted to receive therein a plastic material for expanding the sleeve, said lower member forming a closure for the lower end of the expansible sleeve, said upper and lower members being connected together on their axis by a telescopic connection, said connection limiting the downward movement of the lower member in relation to the upper member, the upper member having a filling opening, the upper member of the telescopic connection having a passage therethrough in communication with the filling opening of the upper member and the chamber of the sleeve. V Y

2. A fdevice asset forth in claim 1 including a closure for'the filling opening'of the upper member.

3. A device as set forth in claim 1 wherein the telescopic connection comprisesanupper ca'g'e.

section through which plastic material from the 0 filling opening will flow to the chamber ofthe sleeve, the lower section of the telesconic, COl'lfif nection having a head slidably mounted within the cage section.

' Number a removable closure plug ior the filling opening in the uppermem'ber. v

" NORMAN C. MCINTYRE.

REFERENCES CITED ".Thellfdllowing references are of record in the file of this patent:

" "jfiini mn STATES PATENTS Name Date Clark Sept. 24, 1940 

